Caption: Prehistoric hominid skeletons. Artwork showing the skeletons of prehistoric hominids (ancestral and early human species) and modern humans. Australopithecus afarensis (centre, female) lived around 3.6 million years ago. Homo erectus (left, male) lived around 1 million years ago. Homo sapiens (right, male, modern huumans) emerged around 200,000 years ago. Artwork by the British illustrator John Sibbick.